cpu_clock_sample

函数名称：Sample a process (thread group) clock for the given task clkid. If the* group's cputime accounting is already enabled, read the atomic* store. Otherwise a full update is required. Task's sighand lock must be

函数原型：static u64 cpu_clock_sample_group(const clockid_t clkid, struct task_struct *p, bool start)

返回类型：u64

参数：

类型	参数	名称
const clockid_t	clkid
struct task_struct *	p
bool	start

346

cputimer等于cputimer

347

pct等于 Empty if CONFIG_POSIX_CPUTIMERS=n

350

如果非READ_ONCE(timers_active)则

351

如果start则hread_group_start_cputime - Start cputime and return a sample*@tsk: Task for which cputime needs to be started*@samples: Storage for time samples* The thread group cputime accouting is avoided when there are no posix* CPU timers armed

353

否则__thread_group_cputime(p, samples)

355

否则

356

proc_sample_cputime_atomic( & cputime_atomic, samples)

359

返回:samples[clkid]

**调用者**
名称	描述
posix_cpu_clock_get
posix_cpu_timer_set	Guts of sys_timer_settime for CPU timers.* This is called with the timer locked and interrupts disabled.* If we return TIMER_RETRY, it's necessary to release the timer's lock* and try again. (This happens when the timer is in the middle of firing.)
posix_cpu_timer_get
posix_cpu_timer_rearm
set_process_cpu_timer	Set one of the process-wide special case CPU timers or RLIMIT_CPU.* The tsk->sighand->siglock must be held by the caller.

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